Category: L

A head-mounted input device to enable computer use by persons with paralysis or limited movement. These devices typically operate through visible or invisible light sources at the tip of the pointer, which transmits a signal to a computer-mounted light sensor or receiver.  

The point at the junction of the outer and middle thirds of a line from the umbilicus to the anterior superior spine of the ilium where a trocar may be introduced safely for paracentesis.  

The point on the line between the two anterior superior iliac spines, one third of the distance from the right spine, indicating the origin of the vermiform appendix.  

Damage to lung tissue that results from aspiration of oils. It may occur repeatedly in patients with impaired swallowing mechanisms or in persons affected by esophageal disorders, such as esophageal carcinoma, achalasia, or scleroderma. Mineral oils and cooking oils often are responsible. Most cases resolve spontaneously, but corticosteroids sometimes are used as treatment to reduce…

A mucosal fold at the lower orifice of the nasolacrimal duct.  

The lumbar plexus and sacral plexus, considered as one.  

A nerve plexus formed by the ventral branches of the first four lumbar nerves.  

A placode developing in the ectoderm directly overlying the optic vesicle. It forms the lens vesicle, which becomes enclosed in the optic cup and eventually becomes the lens of the eye.  

A placenta attached to the lateral wall of the uterus.  

A mixture of liquid hydrocarbons obtained from petroleum. This mixture is used as a vehicle for medicinal substances for local applications. Light petrolatum is employed as a topical spray, whereas heavy petrolatum was once used internally to treat constipation.